package com.atguigu.crowd.mvc.interceptor;

import com.atguigu.crowd.constant.CrowdConstant;
import com.atguigu.crowd.entity.Admin;
import com.atguigu.crowd.exception.AccessForbiddenException;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @description: 登录验证拦截器
 * @program: atcrowdfunding01-admin-parent
 * @author: Mr.Luo
 * @date: 2021-02-08 16:06
 **/
public class LoginInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.通过request对象获取Session对象
        HttpSession session = request.getSession();
        //2.尝试从Session域中获取Admin对象
        Admin admin = (Admin) session.getAttribute(CrowdConstant.ATTR_NAME_LOGIN_ADMIN);
        //3.判断admin对象是否为空
        if(admin == null){
            //抛出异常
            throw new AccessForbiddenException(CrowdConstant.MESSAGE_ACCESS_FORBIDEN);
        }
        return true;
    }
}
